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GB/T 23273.7-2009: Methods for chemical analysis of cobalt oxalate -- Part 7: Determination of sulfate ion content -- Combustion-iodimetry
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 23273.7-2009 | English | 139 |
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Methods for chemical analysis of cobalt oxalate -- Part 7: Determination of sulfate ion content -- Combustion-iodimetry
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GB/T 23273.7-2009
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Basic data | Standard ID | GB/T 23273.7-2009 (GB/T23273.7-2009) | | Description (Translated English) | Methods for chemical analysis of cobalt oxalate -- Part 7: Determination of sulfate ion content -- Combustion-iodimetry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H13 | | Classification of International Standard | 77.120.70 | | Word Count Estimation | 6,647 | | Date of Issue | 2009-01-15 | | Date of Implementation | 2009-11-01 | | Regulation (derived from) | National Standard Approval Announcement 2009 No.2 (Total No.142) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the determination of the amount of sulfate in cobalt oxalate. This section applies to the determination of sulfate in the amount of cobalt oxalate. Measuring range: 0. 002 % to 0. 02 %. | GB/T 23273.7-2009: Methods for chemical analysis of cobalt oxalate -- Part 7: Determination of sulfate ion content -- Combustion-iodimetry
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Methods for chemical analysis of cobalt oxalate Part 7. Determination of sulfate ion content Combusition-iodimetry
ICS 77.120.70
H13
National Standards of People's Republic of China
Methods for chemical analysis of cobalt oxalate
Part 7. Determination of the amount of sulfate ion
Combustion - iodometric method
Posted 2009-01-15
2009-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 23273 "Methods for chemical analysis of cobalt oxalate" a total of eight sections.
--- Part 1. Determination of cobalt content by potentiometric titration
--- Part 2. Determination of lead content of electrothermal atomic absorption spectrometry
--- Part 3. Determination of arsenic content by hydride generation - atomic fluorescence spectrometry
--- Part 4. Determination of silicon content - Molybdenum blue spectrophotometric method
--- Part 5. calcium, magnesium, sodium content - Flame Atomic Absorption Spectrometry
--- Part 6. Determination of the amount of chloride ion selective electrode method
--- Part 7. Determination of sulfate ion content of combustion - iodometric method
--- Part 8. nickel, copper, iron, zinc, aluminum, manganese, lead, arsenic, calcium, magnesium, sodium content - Inductively coupled plasma atomic emission spectrometry
This is Part 7.
This part is proposed by the China Nonferrous Metals Industry Association.
The non-ferrous metal part by the National Standardization Technical Committee.
This section is responsible for drafting Jinchuan Group Limited.
This in part by the Beijing General Research Institute of Mining and Metallurgy, Ganzhou cobalt tungsten Ltd. participated in the drafting.
The main drafters of this section. Zhang Zhi hair, Lixi Kai, Han Min, Lvqing Cheng, Yu Shengjie, Lin Hsiu-ying, Xu Xiaoyan, seeking Tao Jiang, Wan Jian-hong,
Lai Cheng Long, Li Neng Hua.
Methods for chemical analysis of cobalt oxalate
Part 7. Determination of the amount of sulfate ion
Combustion - iodometric method
1 Scope
GB/T 23273 provisions of this part of the determination of the amount of sulfate in cobalt oxalate.
This section applies to the determination of the amount of sulfate in cobalt oxalate. Measurement range. 0.002% to 0.02%.
2 Method summary
Sample in a muffle furnace at 500 ℃ high temperature burning with copper as flux at 1250 ℃ ~ 1300 ℃ burning furnace, which leads to oxygen, like
Products in the decomposition of sulphate sulfur dioxide with starch absorb fluid absorption. Starch as indicator, titrated with iodine titration solution to the standard blue
As the end point.
3 Reagents
3.1 fluxes. copper (w1 Cu≥99.95%, w1 S < 0.0002%, the diameter of 0.25mm ~ 0.50mm, prior to use in addition to a fine sandpaper
To the surface of the oxide, with alcohol cotton wipe clean, cut a length of about 50mm ~ 60mm standby).
3.2 Standard sample. copper standard (w1 S. 0.002% ~ 0.006%).
3.3 starch absorption solution. Weigh 0.05g starch, 4g 0.2g sodium chloride and potassium iodide in 500mL beaker, add water 250mL shake
Even after boiling 2min cooled to room temperature, the time is now equipped.
3.4 potassium dichromate sulfuric acid wash (50g/L). Weigh 5g potassium dichromate, dissolved in a little water heating, cooling, sulfuric acid was added 100mL
(1 + 9).
3.5 iodine standard stock solution [Ba (1/2I2) ≈0.02mol/L]. Weigh 2.5g iodine and 20g potassium iodide in 500mL beaker, add
50mL water, stirring constantly so that the iodine is completely dissolved, filter the brown in 1000mL volumetric flask, constant volume of water.
3.6 standard iodine titration solution [Ba (1/2I2) ≈0.0005mol/L].
3.6.1 preparation. 15mL dispensing iodine standard stock solution (3.5), placed in a brown 500mL volumetric flask, 10g of potassium iodide was added to the water to
Yung, the time is now equipped with, and when calibrated with standard samples with sample analysis.
3.6.2 Calibration. Weigh the appropriate amount of standard copper triplicate samples were plated in porcelain boat. By 5.8 Procedure for calibration.
According to equation (1) to calculate the concentration of iodine standard solution.
Ba (1/2I2) = m1
· W1 S × 2
Vp × 32.06 × 10-3
(1)
Where.
Ba (1/2I2) --- the amount of substance concentration of iodine standard titration solution, expressed in moles per liter (mol/L);
Quality w1 S --- Sample score of sulfur;
Volume Vp --- titration consumption of iodine standard solution, in milliliters (mL);
M1 --- Quality standard sample in grams (g);
32.06 --- sulfur molar mass, in grams per mole (g/moL).
Taking an average of three calibration results. Titration volume within 0.2mL poor range, the mean value, or re-calibration.
4 instruments and equipment
4.1 muffle furnace.
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